Touch display chip, touch display device, terminal device and display driving method

Abstract

The present invention discloses a touch display chip, a touch display device, a terminal device and a display driving method. The display driving method includes: receiving image data and providing a plurality of source data signals according to the image data; detecting whether the output of the plurality of source data signals is a high-noise picture; and adjusting a driving mode of a display driving circuit according to a detection result. By adjusting the driving mode of the display driving circuit for a high-noise picture, the overall jump of data signals in source data lines is reduced, thereby reducing the noise of a touch electrode layer.

Description

Technical Field

[0001] The present invention relates to the technical field of touch display, and particularly to a touch display chip, a touch display device, a terminal device, and a display driving method. Background Art

[0002] In existing touch display devices, a touch sensor layer can be prepared on an OLED thin film encapsulation layer by means of etching, spin coating, etc. to implement a display-touch integration solution. This solution has the advantages of thin thickness, easy flexible deformation, low cost, etc., and is widely used in the small-size OLED market.

[0003] However, the vertical distance between the touch sensor layer and the display cathode in the touch display device is only 7um - 15um. During the touch display process, the cathode electrode is multiplexed; a parasitic capacitance is generated between this cathode electrode and the source data line. When the data signals in multiple source data lines change as a whole, it will cause the voltage of the cathode electrode to fluctuate accordingly and couple to the touch layer, that is, noise that interferes with the touch sensing effect is generated. Moreover, the greater the amplitude of the data signals in adjacent source data lines, the stronger the interference with the touch sensing effect.

[0004] Existing OLED display touch technologies generally use methods such as frequency hopping or synchronization to avoid noise, but there are certain requirements for the noise intensity. When the touch noise intensity in all frequency bands is relatively large, it will lead to touch false alarm events. For example, when the display device shows a picture with black and white stripe intervals, the data signals in each source data line on the display device fluctuate up and down simultaneously. At this time, the noise value coupled to the touch sensor layer is also the largest. Moreover, the higher the gray scale of the display picture, the greater this noise, and the more likely the touch is to have false alarm points. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a touch display chip, a touch display device, a terminal device, and a display driving method, so as to solve the technical defects mentioned in the prior art.

[0006] According to one aspect of the present invention, a display driving method is provided, including:

[0007] Receiving image data and providing multiple source data signals according to the image data;

[0008] Detecting whether the output of the multiple source data signals is a high-noise picture;

[0009] Adjusting the driving mode of the display driving circuit according to the detection result.

[0010] Optionally, the adjusting the driving mode of the display driving circuit according to the detection result includes:

[0011] When the detection result is a normal picture, the first dimming mode or the second dimming mode is adopted;

[0012] When the detection result is a high-noise picture, the third dimming mode or the fourth dimming mode is adopted.

[0013] Optionally, the first dimming mode is DC dimming;

[0014] The second dimming mode is PWM dimming when displaying within the first grayscale voltage range and DC dimming when displaying within the second grayscale voltage range;

[0015] The third dimming mode is PWM dimming;

[0016] The fourth dimming mode is DC dimming when displaying within the first grayscale voltage range and PWM dimming when displaying within the second grayscale voltage range.

[0017] Optionally, the adjusting the driving mode of the display driving circuit according to the detection result further includes:

[0018] When the detection result is a high-noise picture, reduce the grayscale voltage in the source data signal;

[0019] Save the initial grayscale brightness value before reducing the grayscale voltage and the current grayscale brightness value after reducing the grayscale voltage;

[0020] Adjust the current grayscale brightness value until the current grayscale brightness value is consistent with the initial grayscale brightness value.

[0021] Optionally, adjusting the current grayscale brightness value includes:

[0022] Increase the number of power pulse signals per unit time and / or the duty cycle of the power pulse signal on and off time.

[0023] Optionally, after reducing the grayscale voltage in the source data signal, it further includes: simulating and detecting the waveform of the source data signal, and determining whether the noise intensity of the source data signal exceeds a first predetermined threshold.

[0024] Optionally, if the noise intensity of the source data signal is greater than the first predetermined threshold, continue to execute the step of reducing the grayscale voltage in the source data signal until the noise intensity of the source data signal is less than or equal to the first predetermined threshold.

[0025] Optionally, detecting whether the multi-channel source signal output is a high-noise picture includes:

[0026] Determine whether the number of signals outputting the same waveform in all source lines in the display driving circuit is greater than a second preset threshold, and whether the maximum amplitude between the high level and the low level of the signals outputting the same waveform in all source data lines is greater than a third preset threshold. If not, it is determined as a normal picture;

[0027] If so, continue to determine whether the time occupied by the high level or the low level of any one of the signals outputting the same waveform by all the source data lines is greater than a fourth threshold. If not, it is determined as a normal picture; if so, it is determined as a high-noise picture.

[0028] Optionally, when it is determined as a high-noise picture, it is also detected whether there is a relative inversion signal between the source data signal output by any one of the source data lines in all the source data lines and the source data signals output by the surrounding source data lines. If there is the relative inversion signal, the judgment result is corrected to a normal picture; if there is no such relative inversion signal, it is still determined as a high-noise picture.

[0029] According to another aspect of the present invention, a touch display chip is provided, including: a display driving circuit for performing display control,

[0030] wherein, the display driving circuit includes a source driver, an image detection module and a dimming module,

[0031] the source driver is used to provide multiple source data signals to the multiple source data lines according to the image data,

[0032] the image detection module is used to detect whether the output of the multiple source data signals is a high-noise picture,

[0033] the dimming module is used to adjust the driving mode of the display driving circuit according to the judgment result of the image detection module.

[0034] Optionally, the display driving circuit further includes a source voltage control module for adjusting the gray-scale voltage in the source data signals according to the detection result of the image detection module.

[0035] Optionally, the dimming module includes a brightness detection module and a brightness compensation module,

[0036] the brightness detection module is used to detect the brightness of the image displayed on the display panel and save the gray-scale brightness values before and after the adjustment of the source data signals, and the brightness compensation module is used to perform brightness compensation according to the gray-scale brightness values before and after the adjustment of the source data signals.

[0037] the brightness detection module is used to detect the brightness of the image displayed on the display panel and save the gray-scale brightness values before and after the adjustment of the source data signals, and the brightness compensation module is used to perform brightness compensation according to the gray-scale brightness values before and after the adjustment of the source data signals.

[0038] the brightness detection module is used to detect the brightness of the image displayed on the display panel and save the gray-scale brightness values before and after the adjustment of the source data signals, and the brightness compensation module is used to perform brightness compensation according to the gray-scale brightness values before and after the adjustment of the source data signals.

[0039] Optionally, it further includes: a touch driving circuit for performing touch detection,

[0040] wherein, the touch driving circuit further includes: a noise detection module for simulating and detecting the source data signal waveform, and feeding back the detection result to the source voltage control module.

[0041] According to another aspect of the present invention, there is provided a touch display device, including:

[0042] a touch display panel;

[0043] and the touch display driving chip described in any one of the above, for providing driving and / or touch detection signals to the touch display panel.

[0044] Optionally, wherein the display panel in the touch display panel is any one of an organic light emitting diode touch display panel, a quantum dot light emitting diode touch display panel, a mini light emitting diode touch display panel, and a micro light emitting diode touch display panel.

[0045] According to another aspect of the present invention, there is provided a terminal device, wherein the terminal device includes the touch display device according to the above claims.

[0046] The display driving method provided by the present invention adjusts to PWM dimming when displaying a high-noise picture at a high gray level, so as to reduce the overall jump of the data signal in the source data line, thereby reducing the noise of the touch transmission electrode layer.

[0047] In a preferred embodiment, the brightness detection module detects the brightness of the image displayed on the display panel, and saves the gray level brightness values before and after adjustment; the brightness compensation module performs brightness compensation according to the gray level brightness values before and after adjustment, so as to realize that when the image data is a high-noise picture, the gray level voltage is adjusted to reduce noise interference while ensuring that the overall display brightness remains unchanged.

[0048] In a preferred embodiment, this embodiment adds a noise detection module. Through the joint judgment of the display driving circuit and the touch detection circuit, a feedback path for noise judgment is formed at the same time, that is, the image detection module in the display driving circuit judges that the image data is a high-noise picture, and further detects the output data signal through the noise detection module in the touch detection circuit, and controls the source driving circuit to reduce the gray level voltage until the detection result of the noise detection module for the output data signal is a non-high-noise signal, further increasing the adjustment accuracy of the high-noise picture.

[0049] In a preferred embodiment, the above embodiment determines the number of sources outputting the same waveform in the source data lines, the maximum amplitude between the signal high level and the low level of the same waveform output in all the source data lines, and the relationship between the time occupied by any signal high level or low level of the same waveform output in all the source lines and a preset threshold. That is, based on this, the stripe width, stripe voltage value, and stripe width of the screen display are judged. When all three exceed the preset values, it is judged as a high-noise screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0051] Figure 1a Shows a three-dimensional segmentation schematic diagram of a touch display device according to the prior art;

[0052] Figure 1b Shows a planar schematic diagram of a touch display panel according to the prior art;

[0053] Figure 2 Shows a flowchart of a display driving method according to the first embodiment of the present invention.

[0054] Figure 3a Shows a block diagram of a touch display device according to the second embodiment of the present invention;

[0055] Figure 3b Shows a flowchart of a display driving method according to the third embodiment of the present invention;

[0056] Figure 4a Shows a block diagram of a touch display device according to the fourth embodiment of the present invention;

[0057] Figure 4b Shows a flowchart of a display driving method according to the fifth embodiment of the present invention;

[0058] Figure 5a Shows a block diagram of a touch display device according to the sixth embodiment of the present invention;

[0059] Figure 5b Shows a flowchart of a display driving method according to the seventh embodiment of the present invention;

[0060] Figure 6 Shows a flowchart of a method for determining a high-noise screen according to the eighth embodiment of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the respective drawings, the same elements or modules are denoted by the same or similar reference numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale.

[0062] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by a programmable circuit. When an element or circuit is said to be "connected to" another element or when an element or circuit is said to be "connected between" two nodes, it may be directly coupled or connected to another element or there may be intermediate elements, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there are no intermediate elements between the two.

[0063] Meanwhile, in this patent specification and claims, certain terms are used to refer to specific components. Those of ordinary skill in the art should understand that hardware manufacturers may use different terms to refer to the same component. This patent specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in functions of the components as the criterion for distinction.

[0064] In this application, the term "semiconductor structure" refers to the general term for the entire semiconductor structure formed in each step of manufacturing a storage device, including all the layers or regions that have been formed. Many specific details of the present invention are described below, such as the structure, materials, dimensions, processing techniques, and technologies of the device, in order to understand the present invention more clearly. However, as those skilled in the art can understand, the present invention can be implemented without these specific details.

[0065] In addition, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0066] Figure 1a A three-dimensional segmentation schematic diagram of a touch display device according to the prior art is shown;

[0067] Please refer to Figure 1a , the touch display device includes a display panel, a touch electrode layer, a source driver, a gate driver, a light emission control driver (which may not be provided depending on the circuit structure of the pixel unit), a touch driver, and a touch processor (which can be collectively referred to as the touch detection circuit).

[0068] Figure 1b shows a schematic plan view of a touch display panel according to the prior art;

[0069] Combining Figure 1a with Figure 1b , the display panel 10 includes a plurality of gate lines G1 - Gm, a plurality of data lines S1 - Sn, a plurality of pixel regions 101, and a plurality of cathode electrodes provided corresponding to the plurality of pixel regions 101, wherein m and n are both positive integers, and the pixel region 4 is connected to the gate line Gm and the data line Sn. A plurality of pixel units corresponding thereto are included in the plurality of pixel regions. The pixel unit includes a circuit composed of a capacitor, a switching element (e.g., TFT), and a light emitting element (e.g., an organic electroluminescent device OLED). In the display panel, when a scan signal is supplied to the gate line Gm, the pixel unit controls the amount of current supplied to the OLED in response to the data signal supplied to the data line Sn.

[0070] The touch electrode layer 11 includes a plurality of touch driving lines TX and a plurality of touch sensing lines RX, and touch sensing units arranged in a two - dimensional matrix. Touching the touch sensing unit changes the capacitance value or resistance value of the touch sensing unit (depending on whether the touch sensing unit is a capacitive or resistive sensing unit), and the touch detection signal generated by the touched touch sensing unit is different from the touch detection signal generated by the untouched touch sensing unit. Thus, the position of the touched touch sensing unit can be determined according to the change of the touch detection signal.

[0071] However, since the touch detection unit controls the cathode electrode to be multiplexed as the cathode electrode in the touch state to detect the capacitance of the touch display panel. A parasitic capacitance Cst is generated between the cathode electrode and the source data lines S1 - Sn. When the data signals in a plurality of source data lines change as a whole, the voltage of the cathode electrode will fluctuate accordingly and be coupled to the touch layer, that is, noise interfering with the touch sensing effect is generated, and the greater the amplitude of the data signals in adjacent source data lines, the stronger the interference with the touch sensing effect.

[0072] Figure 2 shows a flowchart of a display driving method according to the first embodiment of the present invention.

[0073] As Figure 2As shown, in order to solve the interference caused to the touch sensing effect when the data signals in multiple source data lines change as a whole, there is provided, for example, a display driving method of the first embodiment that can be applied to the touch display device shown in Figure 3a , 4a , and the touch display device of the first embodiment shown in 5a;

[0074] In step S01, image data is received, and multiple source data signals are provided according to the image data.

[0075] The image data is, for example, sent from the system side, and can go through steps such as compression and decompression, and operations such as image magnification, always on display (AOD), adjustment of parameters such as sharpness and contrast, and then sent to the display driving circuit. The source driving circuit in the display driving circuit provides multiple data signals through multiple data lines S1 - Sn. The specific processing method of the image data in the present invention is not limited and can be adjusted according to the actual situation.

[0076] In step S02, it is detected whether the output of the multiple source signals is a high-noise picture.

[0077] In this step, the display driving circuit detects the source data signal. If it is detected that the image data is a high-noise picture.

[0078] In step S03, the driving mode of the display driving circuit is adjusted according to the detection result.

[0079] Among them, according to the above detection result, the driving mode of the touch display panel is adjusted to reduce the interference to the touch sensing effect.

[0080] Figure 3a Shows a block diagram of a touch display device according to a second embodiment of the present invention;

[0081] As Figure 3a shown, in order to solve the interference caused to the touch sensing effect when the data signals in multiple source data lines change as a whole, there is provided a touch display device of the second embodiment of the present invention;

[0082] In the touch display device of this embodiment, it includes a display panel 10, a touch electrode layer 11, a display driving circuit 20, and a touch detection circuit 30. Among them, the display panel 10 and the touch electrode layer 11 are integrated as a whole in the touch display panel. For a clearer description, they are divided into two monomers; although Figure 3aThe respective drive circuits for the touch display panel are shown separately, but by way of example, the respective drive circuits may be integrated in one circuit as a drive circuit (e.g., a drive IC). For example, the display drive circuit and the touch detection circuit in the figure may be integrated into a touch display drive chip for providing drive and / or touch detection signals to the touch display panel, and the drive chip may also include various computing and processing functions.

[0083] The display panel 10 includes a plurality of gate lines G1 - Gm, a plurality of data lines S1 - Sn, pixel units 2 of a plurality of pixel regions 4, organic light-emitting diodes OLED of the plurality of pixel regions 4, and a plurality of cathode electrodes (not shown in the figure) provided corresponding to the plurality of pixel regions 4. Here, both m and n are positive integers, and the display panel 10 may be any one of an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a mini light-emitting diode display panel, and a micro light-emitting diode display panel, etc.

[0084] The display drive circuit 20 includes a gate driver 21, a source driver 22, an image detection module 23, and a dimming module 24.

[0085] The gate driver 21 is used to provide a gate voltage to the touch display panel in a display state; the source driver 22 is used to provide a data signal to the touch display panel in a display state; the image detection module 23 is used to determine whether the picture output to the display panel 10 is a high-noise picture according to the multiplexed data signals provided by the source driver 22; the dimming module 24 is used to perform a dimming operation according to the judgment result of the image detection module 23.

[0086] The touch detection circuit 30 includes a touch detection unit 31 and a multiplexing unit 32. Among them, the multiplexing unit 32 is used to control the cathode electrodes in the display panel to be multiplexed as cathode electrodes; the touch detection unit 31 is used to detect the sensing capacitance of the touch electrode layer 11.

[0087] In a preferred embodiment, the touch display chip further includes a timing controller 50 for providing a first control signal and a second control signal to the display drive circuit 20 and the touch detection circuit 30. Among them, the first control signal is used to control the touch display device to be in a display state; the second control signal is used to control the touch display device to be in a touch state.

[0088] Figure 3b The flowchart of a display drive method according to the third embodiment of the present invention is shown.

[0089] In step S101, image data is received.

[0090] Among them, the image data is sent by the system side, for example, and can go through steps such as compression and decompression, and after operations such as image magnification, always on display (AOD), and adjustment of parameters such as sharpness and contrast, it is sent to the display driving circuit 20. The source driving circuit 22 in the display driving circuit 20 provides multiplexed data signals through multiple data lines S1 - Sn according to the image data. The specific processing method of the image data in the present invention is not limited and can be adjusted according to the actual situation.

[0091] In step S102, it is detected whether the image data is a high-noise picture.

[0092] In this step, the image detection module 23 in the display driving circuit 20 detects the source data signal. If it is detected that the image data is a high-noise picture, steps S103 and S105 are continued. If it is detected that the image data is not a high-noise picture, steps S104 and S105 are continued. Among them, a high-noise picture is, for example, a picture displayed when there are many high-amplitude data signals with the same waveform in the source data signal in one frame of the picture. In this case, the picture noise is large and will affect the display of other data signals.

[0093] In step S103, the dimming module calls the first or second dimming mode.

[0094] When the image detection module 23 detects that the image data is a normal picture, the dimming module 24 controls the display driving circuit 20 to enter the first dimming mode or the second dimming mode. In the above first dimming mode or second dimming mode, the source voltage is output normally. Among them, the first dimming mode is, for example, full DC dimming, and the second dimming mode is PWM (pulse width modulation) dimming when displaying within the first gray-scale voltage range and DC dimming when displaying within the second gray-scale voltage range.

[0095] In step S104, the dimming module calls the third or fourth dimming mode.

[0096] When the image detection module 23 detects that the image data is a high-noise picture, the dimming module 24 controls the display driving circuit 20 to enter the third dimming mode or the fourth dimming mode. Among them, the third dimming mode is, for example, full PWM dimming, and the fourth dimming mode is, for example, DC dimming when displaying within the first gray-scale voltage range and PWM dimming when displaying within the second gray-scale voltage range. In the above third dimming mode or fourth dimming mode, under a high-noise picture, it is necessary to maintain the source voltage and increase the conduction time within one modulation period of the emission control signal EM in PWM dimming to ensure the output brightness.

[0097] Taking the 256 - level gray - scale voltage as an example for the above - mentioned gray - scale voltage range, the first gray - scale voltage range is the first 128 levels of gray - scale voltage, and the second gray - scale voltage range is the last 128 levels of gray - scale voltage. It can be adjusted according to the actual situation, and the present application does not limit this.

[0098] In step S104, drive the touch - display panel in the called dimming mode.

[0099] In this embodiment, when displaying a high - noise picture at a high gray - scale, it is adjusted to PWM dimming to reduce the overall jump of the data signal in the source data line, thereby reducing the noise of the touch - transmission electrode layer.

[0100] Figure 4a The block diagram of the touch - display device according to the fourth embodiment of the present invention is shown;

[0101] As Figure 4a shown, the touch - display device provided in this embodiment is basically the same as the touch - display device provided in the above - mentioned first embodiment, so it will not be elaborated here.

[0102] The difference is that in this embodiment, the display driving circuit 20 in the touch - display device further includes a source - voltage control module 25, which is used to adjust the display gray - scale voltage according to the detection result of the image detection module 23. It no longer switches between the DC dimming mode and the PWM dimming mode through the dimming module, and is applicable to the processing of high - noise pictures in PWM dimming. Exemplarily, the source - voltage module 25 adjusts the amplitude of the source - data signal, and then adjusts the display gray - scale, for example, by changing the register setting in the source driver 22;

[0103] The dimming module 24 in the touch - display device includes a brightness detection module 241 and a brightness compensation module 242. The brightness detection module 241 is used to detect the brightness of the image displayed on the display panel and save the gray - scale brightness values before and after adjustment. The brightness compensation module 242 is used to perform brightness compensation according to the gray - scale brightness values before and after adjustment. Exemplarily, for example, the brightness adjustment is achieved by controlling the number of pulses in the dimming module 24 and the duty cycle of the emission control signal to turn on and off.

[0104] Figure 4b The flowchart of the display driving method according to the fifth embodiment of the present invention is shown. For example, the display driving circuit in the touch - display device shown in Figure 4a is used to execute this display driving method.

[0105] In step S201, receive image data.

[0106] Among them, the image data is sent from the system side, for example, and can go through steps such as compression and decompression, and after being adjusted or operated on parameters such as image magnification, always on display (AOD), sharpness, and contrast, it is sent to the display driving circuit 20. The source driving circuit 22 in the display driving circuit 20 provides multiple data signals through multiple data lines S1 - Sn. The specific processing method of the image data in the present invention is not limited and can be adjusted according to actual situations.

[0107] In step S202, store the initial gray - scale brightness value of the current image data.

[0108] Exemplarily, the brightness detection module 421 detects the brightness of the image currently displayed on the display panel and stores the brightness value of the current image data. For the convenience of description, the initial brightness value is represented as LV0 here, and this representation will be used subsequently.

[0109] In step S203, detect whether the image data is a high - noise picture.

[0110] In this step, the image detection module 23 in the display driving circuit 20 detects the source data signal. If it is detected that the image data is a high - noise picture, step S204 is continued; if it is detected that the image data is not a high - noise picture, step S207 is executed.

[0111] In step S204, control the source driving circuit to reduce the gray - scale voltage;

[0112] When determining whether the image data is a high - noise picture, the source driving circuit reduces the gray - scale voltage. At this time, the brightness detection module 421 detects the brightness of the image displayed on the display panel after adjustment and stores the brightness value of the current image data. For the convenience of description, the adjusted current gray - scale brightness value is represented as LV1 here, and this representation will be used subsequently.

[0113] In step S205, determine whether the initial gray - scale brightness value is the same as the current gray - scale brightness value.

[0114] When the initial gray - scale brightness value LV0 is the same as the current gray - scale brightness value LV1, step S207 is executed; on the contrary, when the initial gray - scale brightness value LV0 is not the same as the current gray - scale brightness value LV1, step S206 is executed until the initial gray - scale brightness value LV0 is the same as the current gray - scale brightness value LV1.

[0115] In step S206, adjust the current gray - scale brightness value through the brightness compensation module.

[0116] Exemplarily, during PWM dimming, a power supply is connected to the anode terminal of the OLED, and then a positive voltage or current is input, while the cathode terminal is connected to GND. When the driving power supply is input, the power supply waveform is an AC power supply (voltage or current) in the PWM form. The brightness compensation module adjusts the duty ratio of the on and off times of the power supply pulse signal between 0 and 100%, or adjusts the number of power supply pulse signals per unit time. When the current gray scale brightness value LV1 is lower than the initial gray scale brightness value LV0, the duty ratio of the power supply waveform is increased or the number of power supply pulse signals per unit time is increased, and vice versa.

[0117] In step S207, the touch display panel is driven in the current mode.

[0118] If the image data is not a high-noise picture, the touch display panel is directly driven to display the image data. If the image data is a high-noise picture, the touch display panel is driven in the adjusted current mode.

[0119] In the above embodiment, the brightness detection module 241 detects the image brightness displayed on the display panel and saves the gray scale brightness values before and after adjustment; the brightness compensation module 242 performs brightness compensation according to the gray scale brightness values before and after adjustment, so as to adjust the gray scale voltage when the image data is a high-noise picture, reduce noise interference, and ensure that the overall display brightness remains unchanged.

[0120] Figure 5a The block diagram of a touch display device according to the sixth embodiment of the present invention is shown;

[0121] As Figure 5a shown, the touch display device provided in this embodiment is basically the same as the touch display device provided in the above third embodiment, so it will not be elaborated here.

[0122] The difference is that in this embodiment, the touch detection circuit 30 in the touch display device further includes a noise detection module 33, which is used to detect the noise intensity of the touch signal in the touch detection unit 31 and feed the detection result back to the source voltage control module 25.

[0123] Figure 5b The flowchart of a display driving method according to the seventh embodiment of the present invention is shown;

[0124] With the above Figure 4bThe difference between the shown method flow chart and others is that after step S304 "controlling the source drive circuit to reduce the gray-scale voltage", it further includes step S305 of determining whether the noise intensity is higher than a threshold value. The noise detection module 33 is used to simulate and detect the waveform of the data signal output from the source, and determine whether the voltage difference value of the waveform of the data signal output from the source exceeds a predetermined threshold value. If the noise intensity is higher than the predetermined threshold value, return to step S304 to continue controlling the source drive circuit to reduce the gray-scale voltage until the noise intensity is less than or equal to the threshold value, and then continue to execute step S306. Among them, the specific value of the above threshold can be adjusted according to the actual situation, and this application does not make any restrictions. In the embodiment, step S304 can be omitted, and only whether the displayed picture judged by the noise detection module 33 is a high-noise picture is used.

[0125] This embodiment adds a noise detection module. Through the combined judgment of the display drive circuit and the touch detection circuit, a feedback path for noise judgment is formed at the same time. That is, the image detection module in the display drive circuit judges that the image data is a high-noise picture, and further, the noise detection module in the touch detection circuit detects the output data signal, controls the source drive circuit to reduce the gray-scale voltage until the detection result of the output data signal by the noise detection module is a non-high-noise signal, further increasing the accuracy of adjusting the high-noise picture.

[0126] Figure 6 It shows the flow chart of the high-noise picture determination method provided by the eighth embodiment of the present invention; as Figure 6 shown, the flow chart of the high-noise picture determination method provided by this embodiment, for example, realizes that the image detection module in the display drive circuit 20 judges whether the image data is a high-noise picture.

[0127] In step S401, it is judged whether the number of signals outputting the same waveform in all source lines is greater than a preset threshold value.

[0128] Exemplarily, judge the number of sources outputting the same waveform in the source data lines S1 - Sn. For example, the number of sources a outputting the same waveform in any frame, and the preset threshold value is b. When a is greater than b, then continue to execute the next step S402. If the number of sources a outputting the same waveform in any frame is less than or equal to the preset threshold value b, then exit the detection and execute step S405, and the picture is normally output, so as to judge the stripe width of the picture display. Among them, the preset threshold value b is, for example, 1 / 8, 1 / 4, 1 / 2 of the total number of columns n, and is specifically determined according to the actual noise intensity of the display panel. This application does not make any restrictions on this.

[0129] In step S402, it is judged that the maximum amplitude between the high level and the low level of the signals outputting the same waveform in all source data lines is greater than a preset threshold value.

[0130] Exemplarily, it is determined whether the maximum amplitude between the signal high level and the low level of the same waveform output in all source data lines S1 - Sn is greater than a preset threshold. When the maximum amplitude is greater than the preset threshold, the next step S403 is continued. When the maximum amplitude is less than or equal to the preset threshold, the detection is exited and step S405 is executed, and the screen is normally output, so as to determine the stripe voltage value of the screen display.

[0131] In step S403, it is determined whether the high level or the high level time of any source signal satisfying step S1 within one frame is greater than a preset threshold.

[0132] Exemplarily, it is determined the time (which can also be called the number of rows) occupied by the high level or the low level of any signal output with the same waveform in all source lines. Assume that within a certain frame, the time of the high level of any signal output with the same waveform in all source lines is c, and the preset threshold is d. (Both c and d are integer multiples of the frame synchronization signal time, and the preset threshold can be adjusted according to the actual situation. When the time of the high level of any signal output with the same waveform in all source lines is c and is greater than the preset threshold d, it is determined as a high-noise screen. When the time of the high level of any signal output with the same waveform in all source lines is c and is less than or equal to the preset threshold d, the detection is exited and step S405 is executed, and the screen is normally output, so as to determine the stripe voltage value of the screen display and the stripe width of the screen display.

[0133] In a preferred embodiment, it further includes detecting whether there is an inverted signal opposite to the output of Si in the data signals output within the range of any data line Si and Si±n. If there is an opposite inverted signal, the judgment result is corrected to a normal screen and the detection is exited. The above Si±n range can be set according to the actual situation, and in a preferred case, it is 10.

[0134] The above embodiment determines the relationship between the number of sources outputting the same waveform in the source data lines S1 - Sn, the maximum amplitude between the signal high level and the low level of the same waveform output in all source data lines S1 - Sn, and the time occupied by the high level or the low level of any signal output with the same waveform in all source lines and the preset threshold, that is, to determine the stripe width, stripe voltage value, and stripe width of the screen display. When all three exceed the preset values, it is determined as a high-noise screen.

[0135] In an embodiment of the present invention, a terminal device is further provided, and the above Figure 3a 、 4a The touch display device shown in 5a is installed on this terminal device. Specifically, this terminal device can be any one of a smart phone, a smart watch, a tablet computer, a notebook computer, an all-in-one computer, and an access control display device. The present invention does not limit this.

[0136] It should be noted that those of ordinary skill in the art can understand that the terms "during", "when", and "while" related to circuit operation used herein are not strict terms indicating actions that occur immediately when the starting action begins, but there may be some small but reasonable one or more delays between them and the reaction actions initiated by the starting action, such as various transmission delays, etc. The terms "about" or "substantially" used herein mean that an element value has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there are always small deviations that make it difficult for the value or position to be strictly the stated value. It has been appropriately determined in the art that a deviation of at least ten percent (10%) (for semiconductor doping concentration, at least twenty percent (20%)) is a reasonable deviation from the described exact ideal target. When used in combination with signal states, the actual voltage value or logical state of a signal (such as "1" or "0") depends on whether positive logic or negative logic is used.

[0137] As described above with reference to the embodiments of the present invention, these embodiments do not describe all the details in detail, nor do they limit the invention to only the specific embodiments. Obviously, according to the above description, many modifications and variations can be made. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and its modifications based on the present invention. The protection scope of the present invention should be defined by the scope defined by the claims of the present invention and their equivalents.

Claims

1. A display driving method, comprising: Receiving image data and providing a plurality of source data signals according to the image data; Detecting whether the output of the plurality of source data signals is a high-noise picture; And Adjusting the driving mode of the display driving circuit according to the detection result, wherein, in the case of the high-noise picture, driving the display driving circuit according to a first driving mode or a second driving mode, The first driving mode includes: adopting PWM dimming at least when displaying within a grayscale voltage range higher than a preset value, The second driving mode includes: reducing the grayscale voltage in the source data signal, and increasing the number of power pulse signals per unit time and / or increasing the duty ratio of the on and off times of the power pulse signal, so that the current grayscale brightness value after reducing the grayscale voltage is consistent with the initial grayscale brightness value before reducing the grayscale voltage.

2. The display driving method according to claim 1, wherein, The display driving method further includes: When the detection result is a normal picture, adopting a first dimming mode or a second dimming mode, The first dimming mode is DC dimming, The second dimming mode is adopting the PWM dimming when displaying within a first grayscale voltage range and adopting DC dimming when displaying within a second grayscale voltage range, The first grayscale voltage range includes the grayscale voltage range lower than or equal to the preset value, and the second grayscale voltage range includes the grayscale voltage range higher than the preset value.

3. The display driving method according to claim 2, wherein, The first driving mode includes: global PWM dimming; or DC dimming when displaying within the first grayscale voltage range and PWM dimming when displaying within the second grayscale voltage range.

4. The display driving method according to claim 1, wherein, After reducing the grayscale voltage in the source data signal, it further includes: simulating and detecting the waveform of the source data signal, and judging whether the noise intensity of the source data signal exceeds a first predetermined threshold.

5. The display driving method according to claim 4, wherein, If the noise intensity of the source data signal is greater than the first predetermined threshold, continue to execute the step of reducing the grayscale voltage in the source data signal until the noise intensity of the source data signal is less than or equal to the first predetermined threshold.

6. The display driving method according to claim 1, wherein, Detecting whether the output of the plurality of source data signals is a high-noise picture includes: Judging whether the number of signals with the same waveform output in all source lines in the display driving circuit is greater than a second preset threshold, and whether the maximum amplitude between the high level and the low level of the signals with the same waveform output in all source data lines is greater than a third preset threshold. If not, it is judged as a normal picture; If so, continue to judge whether the time occupied by any high level or low level of the signals with the same waveform output by all the source data lines is greater than a fourth threshold. If not, it is judged as a normal picture; if so, it is judged as a high-noise picture.

7. The display driving method according to claim 6, wherein, In the case of judging as a high-noise picture, it also detects whether there is a relative inverted signal between the source data signal output by any one of the source data lines in all the source data lines and the source data signals output by the surrounding source data lines. If there is the relative inverted signal, the judgment result is corrected to a normal picture; if there is no such relative inverted signal, it is still judged as a high-noise picture.

8. A touch display chip, comprising: A display driving circuit for performing display control, Among them, the display driving circuit includes a source driver, an image detection module, and a dimming module. The source driver is configured to provide multiple source data signals to multiple source data lines according to image data. The image detection module is configured to detect whether the output of the multiple source data signals is a high-noise picture. The dimming module is configured to adjust the driving mode of the display driving circuit according to the judgment result of the image detection module. Among them, in the case of the high-noise picture, the dimming module adjusts the driving mode to the first driving mode or the second driving mode. The first driving mode includes: when displaying at least in a gray-scale voltage range higher than a preset value, PWM dimming is adopted. The second driving mode includes: reducing the gray-scale voltage in the source data signal, and increasing the number of power pulse signals per unit time and / or increasing the duty cycle of the on and off times of the power pulse signal, so that the current gray-scale brightness value after reducing the gray-scale voltage is the same as the initial gray-scale brightness value before reducing the gray-scale voltage.

9. The touch display chip according to claim 8, wherein, The display driving circuit further includes a source voltage control module, configured to adjust the gray-scale voltage in the source data signal according to the detection result of the image detection module.

10. The touch display chip according to claim 9, wherein, The dimming module includes a brightness detection module and a brightness compensation module. The brightness detection module is configured to detect the brightness of the image displayed on the display panel and store the gray-scale brightness values before and after the adjustment of the source data signal. The brightness compensation module is configured to perform brightness compensation according to the gray-scale brightness values before and after the adjustment of the source data signal.

11. The touch display chip according to claim 9 further comprises: A touch driving circuit, configured to perform touch detection. Among them, the touch driving circuit further includes: a noise detection module, configured to simulate and detect the waveform of the source data signal, and feed the detection result back to the source voltage control module.

12. A touch display device, comprising: A touch display panel; And the touch display chip according to any one of claims 8-11, configured to provide driving and / or touch detection signals to the touch display panel.

13. The touch display device according to claim 12, wherein, The display panel in the touch display panel is any one of an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a mini light-emitting diode display panel, and a micro light-emitting diode display panel.

14. A terminal device, wherein, The terminal device includes the touch display device according to claim 12 or 13.

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